Environmental friendly film capacitors-Italian ICAR

Battery, motor and motor control technology are the three cores of new energy vehicles. In the motor drive and control circuit, the main electronic components required are power semiconductor devices IGBT, control IC and capacitor, of which IGBT accounts for about 2/3 of the cost.

The core of the motor control technology is the inverter technology that requires efficient motor control. The inverter technology of high efficiency motor control requires a powerful IGBT module and a matching DC support capacitor.

For a long time, ceramic capacitors and aluminum electrolytic capacitors are the most common capacitor electronic components on the market. They are widely used in various electronic products, mainly in the circuit system for filtering, frequency modulation, DC isolation and time control.

With the intensification of automotive electrification, the voltage and output power of automotive circuit systems have been greatly improved, and the critical components have stricter requirements on the voltage and impact resistance of electronic components. The changes in working conditions put forward new requirements for the performance of capacitive components in electronic systems, thereby driving the automotive industry's demand for film capacitors.

The film capacitor is the main component in the drive circuit of electric vehicles, which mainly plays a smoothing role. The inverter converts the direct current of the battery into a voltage with small fluctuations through the converter, and then converts it into a rectangular wave similar to alternating current through the IGBT switching element. The resulting surge voltage is very large and needs to be eliminated with a smoothing capacitor.

In the field of new energy vehicles, the existing aluminum electrolytic capacitors will be partially replaced by film capacitors in the future. At present, more and more companies have replaced electrolytic capacitors with film capacitors. Both BYD "Qin" and Tesla Model 3 use film capacitors.